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Income Taxes (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Net income tax expense (benefit) $ 29,000 $ 77,000 $ 119,000 $ 147,000  
Unrecognized tax benefits that would affect effective tax rate $ 0   $ 0   $ 0
Corporate income tax rate     21.00%   35.00%